[tahoe-dev] proposal: add padding

[Olaf TNSB]

Am I missing something simple here?  You pad pre-encryption and unless the
encryption algorithm is completely flawed then slightly different input
files will give completely different output.

In a similar (but entirely unrelated way!) look at the
MD5/SHA256/your-fav-hash-function of the numbers 11 & 12. Do you see any
similarities in the hash?

Olaf
On 12/07/2013 5:58 PM, "Iraklis ." <leontiad at gmail.com> wrote:

>  But still someone can identify the common pattern at the end of two or
> more similar files so the pad can be detected and deleted, thus length is
> not hidden.
> On 07/11/2013 09:01 PM, Tony Arcieri wrote:
>
> On Wed, Jul 10, 2013 at 7:31 AM, Ed Kapitein <ed at kapitein.org> wrote:
>
>> Hi Zooko,
>>
>> Be careful with zero padding, it might leave the data open for a
>> watermarking attack.
>>
>
>  How about padding with the output of a PRNG seeded with the content
> hash? That way it'd still be deterministic
>
>  --
> Tony Arcieri
>
>
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